Motion Sensor Key Fob for Hands-Free Vehicle Door Control
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Solution Overview
Problem
Existing remote keyless entry systems for vehicles face challenges such as battery drain due to increased functionality, lack of intuitive operation for users with disabilities or carrying objects, and vulnerability to environmental conditions like snow and ice affecting capacitive sensors.
Innovation Solution
A system using a hand-held communication device with a motion sensor that wirelessly transmits command signals based on pedestrian motions, allowing for remote control of vehicle doors without the need for button pressing, and includes a key fob with a battery-saving circuit and inertial motion sensing for improved usability and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple functions are added to the remote keyless entry system, then the functionality and versatility are improved, but the battery drain increases
Solution Approach 1:
The system uses periodic motion detection through the accelerometer to trigger RF signal transmission only when specific walking patterns are detected, rather than continuously monitoring or requiring manual button presses. This periodic activation based on detected motion events significantly reduces battery consumption while maintaining full functionality for multiple vehicle operations.
2Ease of operation
If capacitive sensors are used for touchless operation, then the ease of operation is improved, but the reliability deteriorates due to environmental conditions like snow and ice
Solution Approach 1:
The system replaces capacitive touch sensors with an accelerometer-based motion detection system. Instead of detecting static touch or proximity through electrical capacitance changes, the system uses mechanical motion sensing to detect walking patterns and trigger operations, eliminating the reliability issues associated with capacitive sensors in cold, snowy, or icy conditions.
3Reliability
If button pressing is required for operation, then the reliability of signal transmission is improved, but the ease of operation deteriorates for users with disabilities or carrying objects
Solution Approach 1:
The system enables users to operate the vehicle without manual intervention by automatically detecting their approach through motion sensing. The accelerometer identifies walking patterns and triggers the appropriate RF commands without requiring the user to press buttons, making the system accessible to users with disabilities or those carrying objects while maintaining reliable signal transmission through the established RF protocol.
4Ease of operation
If the communication range is extended, then the ease of operation is improved, but the vulnerability to signal interception and spoofing increases
Solution Approach 1:
The system performs preliminary authentication and encryption setup before extending communication range. By establishing secure encrypted channels in advance and using motion-activated transmission to limit exposure time, the system can operate at extended ranges while maintaining security against interception and spoofing attempts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances user convenience by allowing hands-free operation, reduces battery drain, and improves accessibility for users with disabilities, while being less susceptible to environmental interference.
Implementation Method 1
A hand-held communication device such as a key fob including a motion sensor operative to provide motion signals as a function of motions made by a pedestrian carrying the hand-held device
Implementation Method 2
capable of wirelessly transmitting and receiving, respectively, command signals
Data Source
AI summary
A system for remotely controlling the position of a land vehicle door is provided. The system includes a mobile communication device supported on the vehicle for movement therewith and a hand-held communication device such as a key fob including a motion sensor operative to provide motion signals as a function of motions made by a pedestrian carrying the hand-held device. Control logic is coupled to the devices and is operative to detect a sequence of step motions made by the pedestrian carrying an authorized hand-held device when the pedestrian carrying the authorized hand-held device is located within a predetermined, short range of the mobile device and to generate a door-opening control signal based on command data contained within a command signal transmitted by the hand-held device and/or when the control logic recognizes the detected sequence of step motions as a door-opening pedestrian command.